Without a doubt, cramming for the test.

This is not a complete sentence. The phrase "cramming for the test" is either a gerund or praticipial phrase, but there's no subject or verb here.

When you decide how you'll make this into a complete sentence, please repost and someone here will give you feedback.

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Here are some websites that might help you figure this out:

http://grammar.ccc.commnet.edu/grammar/fragments.htm

http://www.uottawa.ca/academic/arts/writcent/hypergrammar/bldsent.html

http://owl.english.purdue.edu/handouts/grammar/g_frag.html

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